39. Which question can the passage answer?
(A) Where was the first spiral staircase constructed?
(B) Who was the first designer of the spiral staircase?
(C) What is the world’s most famous spiral staircase?
(D) Why is the spiral staircase popular in modern times?

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統計： A(0), B(0), C(1), D(9), E(0) #3806608